SU77967A1 - A method of manufacturing chrome-aluminosilicate refractories - Google Patents

Description

Conducted research has shown that special types of refractory materials characterized by high refractoriness (above 1900 ° C), good resistance to the action of basic and acidic ferrous iron (low porosity (4.5–5)) can be obtained on the basis of chromite and high alumina silicate raw materials. 11, and high mechanical strength irn high temperatures (1500–1550 ° C) (the onset of deformation of the load to 2 kgcm, temporary resistance to cold in the cold 1500 kgcm-.

On the basis of the work performed by the United States, a snapshot is offered to manufacture a shade of products from chromium-aluminosilicate refractory materials, consisting in the use of materials, their composition, their charge of certain fractions, as well as the use of a special technology for their manufacture.

Highly ground chamotte made from 51 of technical alumina and refractory city of thine in a ratio of 90:10.

Chamotte firing is carried out at a temperature of 1600 ° C with an irri exposure and maximum temperature for 12 hours. The porosity of the resulting fireclay varies from 1.2-5.

Annealed high clay chamotte is crushed on a Black to a crusher of 150-200 M.-t, then it is ground under runners to a grain size of less than 2 mm. part of the chamotte is subjected to HUMOLAU in a ball mill with fine grinding to grain sizes less than 0.088 mm.

Chromite with a CO2 content of at least 35% is subjected to grinding on runners to a grain size of less than 2 mm, and then in a dry-grinding ball mill to a grain size less than 0.088, i; .w.

The mixture for the manufacture of products is made by weight: -JO and chamotte with a grain size of less than 2 mm and 45% with a grain size of less than 0.088 mm 15% of chromite with a grain size of less than 0.088 mm.

Chamotte with grains less than 0.088 mm and chromite with grains less than 0.088 mm are mixed for two hours in a dry gLemol ball mill, then the mixture is fed into wet grinding runners, and chamotte with grains less than 2 mm is added to the same; All the charge is not recycled under the runners for 20-30 minutes at a mass's moisture content.

To ensure the necessary strength of the raw material and the molding properties of the mass, 2o molasses are added during the processing of the mass under the runners.

Products are made from semi-dry masses by pressing or tamping.

The products are fired at a temperature of 1550 -1 ° OEP with an exposure at a maximum temperature of 8-10 hours.

Subject invented and to

The method of making refractories with the introduction of high silica clay (yamostoyamot and chromite in a crushed state, characterized by the fact that high-alumina chamotte is used in grains with a size less than 2 mm in an amount of 40% and grains with a size less than 0, 088 mm in an amount of 45%, chromite is used in grains with a mech-size of 0.088 mm in an amount of 15% of the total amount of chamotte and chromite; v. charge, and firing of products from this charge is performed at a temperature of i550-1600С, with an exposure time of maximum temperature 8-10 hours